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1da177e4 LT |
1 | /* |
2 | * acpi_system.c - ACPI System Driver ($Revision: 63 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | #include <linux/proc_fs.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/init.h> | |
29 | #include <asm/uaccess.h> | |
30 | ||
31 | #include <acpi/acpi_drivers.h> | |
32 | ||
1da177e4 | 33 | #define _COMPONENT ACPI_SYSTEM_COMPONENT |
4be44fcd | 34 | ACPI_MODULE_NAME("acpi_system") |
1da177e4 LT |
35 | #define ACPI_SYSTEM_CLASS "system" |
36 | #define ACPI_SYSTEM_DRIVER_NAME "ACPI System Driver" | |
37 | #define ACPI_SYSTEM_DEVICE_NAME "System" | |
38 | #define ACPI_SYSTEM_FILE_INFO "info" | |
39 | #define ACPI_SYSTEM_FILE_EVENT "event" | |
40 | #define ACPI_SYSTEM_FILE_DSDT "dsdt" | |
41 | #define ACPI_SYSTEM_FILE_FADT "fadt" | |
793c2388 | 42 | extern struct fadt_descriptor acpi_fadt; |
1da177e4 LT |
43 | |
44 | /* -------------------------------------------------------------------------- | |
45 | FS Interface (/proc) | |
46 | -------------------------------------------------------------------------- */ | |
47 | ||
4be44fcd | 48 | static int acpi_system_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 49 | { |
1da177e4 LT |
50 | |
51 | seq_printf(seq, "version: %x\n", ACPI_CA_VERSION); | |
d550d98d | 52 | return 0; |
1da177e4 LT |
53 | } |
54 | ||
55 | static int acpi_system_info_open_fs(struct inode *inode, struct file *file) | |
56 | { | |
57 | return single_open(file, acpi_system_read_info, PDE(inode)->data); | |
58 | } | |
59 | ||
60 | static struct file_operations acpi_system_info_ops = { | |
4be44fcd LB |
61 | .open = acpi_system_info_open_fs, |
62 | .read = seq_read, | |
63 | .llseek = seq_lseek, | |
64 | .release = single_release, | |
1da177e4 LT |
65 | }; |
66 | ||
4be44fcd LB |
67 | static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t, |
68 | loff_t *); | |
1da177e4 LT |
69 | |
70 | static struct file_operations acpi_system_dsdt_ops = { | |
4be44fcd | 71 | .read = acpi_system_read_dsdt, |
1da177e4 LT |
72 | }; |
73 | ||
74 | static ssize_t | |
4be44fcd LB |
75 | acpi_system_read_dsdt(struct file *file, |
76 | char __user * buffer, size_t count, loff_t * ppos) | |
1da177e4 | 77 | { |
4be44fcd LB |
78 | acpi_status status = AE_OK; |
79 | struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL }; | |
80 | ssize_t res; | |
1da177e4 | 81 | |
1da177e4 | 82 | |
b229cf92 | 83 | status = acpi_get_table(ACPI_TABLE_ID_DSDT, 1, &dsdt); |
1da177e4 | 84 | if (ACPI_FAILURE(status)) |
d550d98d | 85 | return -ENODEV; |
1da177e4 LT |
86 | |
87 | res = simple_read_from_buffer(buffer, count, ppos, | |
88 | dsdt.pointer, dsdt.length); | |
02438d87 | 89 | kfree(dsdt.pointer); |
1da177e4 | 90 | |
d550d98d | 91 | return res; |
1da177e4 LT |
92 | } |
93 | ||
4be44fcd LB |
94 | static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t, |
95 | loff_t *); | |
1da177e4 LT |
96 | |
97 | static struct file_operations acpi_system_fadt_ops = { | |
4be44fcd | 98 | .read = acpi_system_read_fadt, |
1da177e4 LT |
99 | }; |
100 | ||
101 | static ssize_t | |
4be44fcd LB |
102 | acpi_system_read_fadt(struct file *file, |
103 | char __user * buffer, size_t count, loff_t * ppos) | |
1da177e4 | 104 | { |
4be44fcd LB |
105 | acpi_status status = AE_OK; |
106 | struct acpi_buffer fadt = { ACPI_ALLOCATE_BUFFER, NULL }; | |
107 | ssize_t res; | |
1da177e4 | 108 | |
1da177e4 | 109 | |
b229cf92 | 110 | status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &fadt); |
1da177e4 | 111 | if (ACPI_FAILURE(status)) |
d550d98d | 112 | return -ENODEV; |
1da177e4 LT |
113 | |
114 | res = simple_read_from_buffer(buffer, count, ppos, | |
115 | fadt.pointer, fadt.length); | |
02438d87 | 116 | kfree(fadt.pointer); |
1da177e4 | 117 | |
d550d98d | 118 | return res; |
1da177e4 LT |
119 | } |
120 | ||
4be44fcd | 121 | static int __init acpi_system_init(void) |
1da177e4 | 122 | { |
4be44fcd | 123 | struct proc_dir_entry *entry; |
1da177e4 | 124 | int error = 0; |
4be44fcd | 125 | char *name; |
1da177e4 | 126 | |
1da177e4 LT |
127 | |
128 | if (acpi_disabled) | |
d550d98d | 129 | return 0; |
1da177e4 LT |
130 | |
131 | /* 'info' [R] */ | |
132 | name = ACPI_SYSTEM_FILE_INFO; | |
4be44fcd | 133 | entry = create_proc_entry(name, S_IRUGO, acpi_root_dir); |
1da177e4 LT |
134 | if (!entry) |
135 | goto Error; | |
136 | else { | |
137 | entry->proc_fops = &acpi_system_info_ops; | |
138 | } | |
139 | ||
140 | /* 'dsdt' [R] */ | |
141 | name = ACPI_SYSTEM_FILE_DSDT; | |
142 | entry = create_proc_entry(name, S_IRUSR, acpi_root_dir); | |
143 | if (entry) | |
144 | entry->proc_fops = &acpi_system_dsdt_ops; | |
4be44fcd | 145 | else |
1da177e4 LT |
146 | goto Error; |
147 | ||
148 | /* 'fadt' [R] */ | |
149 | name = ACPI_SYSTEM_FILE_FADT; | |
150 | entry = create_proc_entry(name, S_IRUSR, acpi_root_dir); | |
151 | if (entry) | |
152 | entry->proc_fops = &acpi_system_fadt_ops; | |
153 | else | |
154 | goto Error; | |
155 | ||
4be44fcd | 156 | Done: |
d550d98d | 157 | return error; |
1da177e4 | 158 | |
4be44fcd | 159 | Error: |
1da177e4 LT |
160 | remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir); |
161 | remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir); | |
162 | remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir); | |
163 | ||
164 | error = -EFAULT; | |
165 | goto Done; | |
166 | } | |
167 | ||
1da177e4 | 168 | subsys_initcall(acpi_system_init); |